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LG 55LW540S Service Manual Download Page 16

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LGE Internal Use Only

Copyright  © 

 LG Electronics. Inc. All rights reserved.

Only for training and service purposes

2. Digital/Analog TV Video

Check the RF cable and RF signal 

Check the Tuner 3.3V 

; L3704: +3.3V

Check the Tuner Signal

 : TU3703  3,4,5,6,7 pin

No

No

No

Yes

Yes

Yes

Check the LVDS output signal of 

SoC(IC101)

Exchange the L3704

Exchange the Tuner

Exchange the SoC(IC101)

Or Main board

Summary of Contents for 55LW540S

Page 1: ...P NO MFL69569607 1605 REV00 CHASSIS LA6ES MODEL 55LW540S 55LW540S UA CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL Internal Use Only ...

Page 2: ...ics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING GUIDE 15 BLOCK DIAGRAM 23 EXPLODED VIEW 24 DISASSEMBLY 25 ...

Page 3: ...inals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed m...

Page 4: ...lectrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent poten tial shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent...

Page 5: ...he solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replace...

Page 6: ... followed 2 Demanded other specification Safety CE IEC specification EMC CE IEC specification 4 General Specification No Item Specification Result Remark 1 Receiving System ATSC NTSC M 64 256 QAM 2 Available Channel 1 VHF 02 13 2 UHF 14 69 3 DTV 02 69 4 CATV 01 135 5 CADTV 01 135 3 Input Voltage AC 100 240V 50 60Hz Mark 110V 60Hz N America 4 Market NORTH AMERICA 5 Screen Size 60 65 inch Wide 1920 ...

Page 7: ...9 1920 1080 67 50 60 00 148 5 HDTV 1080P O 5 2 Component input Y CB PB CR PR No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remark 1 720 480 15 73 60 00 13 513 SDTV DVD 480I 2 720 480 15 73 59 94 13 500 SDTV DVD 480I 3 720 480 31 50 60 00 27 027 SDTV 480P 4 720 480 31 47 59 94 27 000 SDTV 480P 5 1280 720 45 00 60 00 74 250 HDTV 720P 6 1280 720 44 96 59 94 74 176 HDTV 720P 7 1920 1080 ...

Page 8: ...720 480 31 47 59 94 27 00 SDTV 480P 5 1280 720 45 00 60 00 74 25 HDTV 720P 6 1280 720 44 96 59 94 74 176 HDTV 720P 7 1920 1080 33 75 60 00 74 25 HDTV 1080I 8 1920 1080 33 72 59 94 74 176 HDTV 1080I 9 1920 1080 67 50 60 00 148 50 HDTV 1080P 10 1920 1080 67 43 59 94 148 352 HDTV 1080P 11 1920 1080 27 00 24 00 74 25 HDTV 1080P 12 1920 1080 26 97 23 97 74 176 HDTV 1080P 13 1920 1080 33 75 30 00 74 25 ...

Page 9: ...oard level and Final assembly adjustment items can be check using In Start Menu 1 Adjust Check Component 1080p and RGB PC Adjust will be calculated by 480i adjust value 3 2 Final assembly adjustment 1 White Balance adjustment 2 RS 232C functionality check 3 Factory Option setting per destination 4 Shipment mode setting In Stop 5 GND and HI POT test 3 3 Appendix 1 Shipment conditions 2 Tool option ...

Page 10: ...h Panel s W B deviation 2 How it works When R G B gain in the OSD is at 192 it means the panel is at its Full Dynamic Range Case Cool Mode To adjust the white balance without the saturation G gain should be adjust at least 172 and change the others R B Gain When R or B gain is over 255 G gain can be adjust below 172 Case Medium Warm Mode To adjust the white balance without the saturation Fix the o...

Page 11: ...ing POWER ON 2 Zero Calibrate the probe of Color Analyzer then place it on the center of LCD module within 10cm of the surface 3 Press ADJ key EZ adjust using adj R C 6 White Balance then press the cursor to the right KEY When KEY is pressed 204 Gray 80IRE internal pattern will be displayed 4 Adjust modes Cool Fix the G gain at least 172 and change the others R B Gain If R or B gain is over 255 G ...

Page 12: ...ls in Non USA North America due to rating 2 Applied model LA4AA Chassis applied to CANADA and MEXICO 5 2 2 Country Group selection 1 Press ADJ key on the Adj R C and then select Country Group Menu 2 Depending on destination select US then on the lower Country option select US CA MX Selection is done using KEY 5 2 3 Tool Option inspection Press Adj key on the Adj R C then select Tool option 5 3 Shi...

Page 13: ...ne wave signal 0 7Vrms 7 2 Specification 8 USB S W Download optional Service only 1 Put the USB Stick to the USB socket 2 Automatically detecting update file in USB Stick If your downloaded program version in USB Stick is lower than that of TV set it didn t work Otherwise USB data is automatically detected 3 Show the message TV Software Update Expert 4 Updating is staring 5 Updating Completed The ...

Page 14: ...xternal speaker to speaker out port with phone jack on TV side as below 2 Check the Max speaker output is 1W or not Sine wave with 1KHz will be displayed 3 Check Both of the signal in speaker Power only mode Fived 1W Default Check the input signal 1KHZ Sine wave and the wave of output by utilizing oscilloscope 5HFRPPHQGHG QSXW 6LJQDO 5 N 6LQH ZDYH ...

Page 15: ...utput Voltage of power block IC400 5V IC400 1 1V IC404 1 5V Q406 3 3V Make sure the Power Connector or Exchange the L403 Make sure the disconnection of Main board 13 2V circuit Exchange the Circuit board No No No No No No No No Yes Yes Yes Yes Yes Yes Yes Yes No No Make sure the PWR_ON of P401 1pin 3 3V Make sure the voltage of LVDS Power Q405 13 2V Make sure the Power Connector or Exchange the L4...

Page 16: ... and service purposes 2 Digital Analog TV Video Check the RF cable and RF signal Check the Tuner 3 3V L3704 3 3V Check the Tuner Signal TU3703 3 4 5 6 7 pin No No No Yes Yes Yes Check the LVDS output signal of SoC IC101 Exchange the L3704 Exchange the Tuner Exchange the SoC IC101 Or Main board ...

Page 17: ...801 No No No Yes Yes Yes Check the HDMI_DET HPD signal Exchange the IC or download The EDID data Exchange the HDMI Jack Exchange the Resistor R803 R808 R809 R814 Q800 Make sure the input signal type and Our TV can support the signal Yes Check the voltage of HDCP EEPROM I2C Signal IC104 Check the HDMI signal No No No Yes Yes Yes Check the LVDS signal output Exchange the defective IC Exchange the So...

Page 18: ...ta Exchange the D SUB Jack Exchange the resistor R3308 No Exchange the SoC IC101 Or Main board Check the RGB cable defect or status of conductor Check the EDID Check the P3300 H V_Sync R G B signal Yes Yes Yes Check the DSUB_DET signal R3308 Make sure the input signal type and Our TV can support the signal Yes Check the LVDS output signal of SoC IC101 Yes ...

Page 19: ...xchange the AV Jack Or R237 Exchange the AV Jack Or R1713 Make sure the LVDS output signal of SoC IC101 No Yes Exchange the SoC IC101 Or Main board Make sure the input signal type and Our TV can support the signal Check the Component cable defect or status of conductor Make sure the JK1702 Y Pb Pr signal R235 R237 R239 No No Yes Yes Yes Make sure the Component DET signal R1712 Exchange the Compone...

Page 20: ...the AMP IC or Main board Check the AMP I2C Line R140 R141 No Yes Check the I2C signal or Exchange the SoC IC101 No Yes Check the SoC IC101 I2S output AR5601 Check the I2C signal or Exchange the SoC IC101 Check the Audio output signal and coil L5602 L5603 L5604 L5605 No Yes Exchange the Audio AMP IC5600 or Coil No Yes Check the connector P5600 Exchange the connector If the connector is defect Check...

Page 21: ...e Check the Tuner 3 3V L3704 No Yes Exchange the L3704 No Yes Check the SIF signal R3704 Exchange the Tuner Check the Speaker resistor or connector No Yes Exchange the speaker Check the cable is defective No Yes Check the signal of JK1702 R1714 R1715 Exchange the Jack Implement the 8 Audio of all input Of Malfunction guide Yes 8 TV Audio 9 Component RGB Audio ...

Page 22: ...eplace L3400 Replace SoC IC101 or Main Board Check AMP IC IC3400 Mute High R3403 4pin No Yes Check signal line Or replace SoC IC101 No Yes Check AMP IC IC3400 Output L3401 L3402 replace AMP IC IC3400 Check Output Signal JK3400 4 5 pin No Yes Replace Phone Jack JK3400 No Yes Check JK3400 Replace Phone Jack if found to be damaged Check External Speaker No Yes Replace External speaker 10 External Spe...

Page 23: ... M1A 128MB IC101 Connector P4600 KEY1 2 LED_R IR SIDE USB 1 2 JK700 JK3101 HDMI2 JK801 CK D0 D1 D2 _HDMI4 DDC_SCL SDA_4 HDMI_CEC SIDE_USB_DM DP USB1_CTL SN1406035RGER 5V_USB SENSOR_I2C TU_SCL SDA IF_N P_MSTAR TDJS H301F Half NIM IF_AGC_MAIN COMP_L R_IN COMP_Y AV_CVBS_IN COMP_Pb Pr CK D0 D1 D2 _HDMI2 DDC_SCL SDA_2 HDMI_CEC REAR HDMI1 JK800 Comp1 AV1 JK1702 SPDIF_OUT SPDIF Optic JK1001 RS232C DSUB S...

Page 24: ...haracteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMPORTANT SAFETY NOTICE 200 400 800 540 521 530 LV1 950 121 820 901 700 A10 120 90...

Page 25: ... rights reserved Only for training and service purposes 1 Disassemble parts Back Cover Disassemble Total Screw No 42ea DISASSEMBLY Screw 18 ea Screw 4 ea 32 3 3 3 P4001 Screw 9EA 7 7 7 8 8 8 9 9 9 9 9 9 9 9 9 10 11 9 12 12 12 12 13 13 SPEAKER R SPEAKER L 6 6 5 ...

Page 26: ... 26 LGE Internal Use Only Copyright LG Electronics Inc All rights reserved Only for training and service purposes Screw 4EA b b a b b a a a b b b b 14 14 15 15 15 15 16 16 16 16 TOP BOTTOM 17 18 19 ...

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